Both of these macros are macros I found online and adapted to my use. I am using this code and it works well to separate specific data into new sheets:

Sub Copy_To_Worksheets()
'Note: This macro use the function LastRow
Dim My_Range As Range
Dim FieldNum As Long
Dim CalcMode As Long
Dim ViewMode As Long
Dim ws2 As Worksheet
Dim Lrow As Long
Dim cell As Range
Dim CCount As Long
Dim WSNew As Worksheet
Dim ErrNum As Long
'Set filter range on ActiveSheet: A1 is the top left cell of your filter range
'and the header of the first column, D is the last column in the filter range.
'You can also add the sheet name to the code like this :
'Worksheets("Sheet1").Range("A1:D" & LastRow(Worksheets("Sheet1")))
'No need that the sheet is active then when you run the macro when you use this.
Set My_Range = Range("A1:Z" & Range("A" & Rows.Count).End(xlUp).Row)
My_Range.Parent.Select
If ActiveWorkbook.ProtectStructure = True Or _
My_Range.Parent.ProtectContents = True Then
MsgBox "Sorry, not working when the workbook or worksheet is protected", _
vbOKOnly, "Copy to new worksheet"
Exit Sub
End If
'This example filters on the first column in the range(change the field if needed)
'In this case the range starts in A so Field:=1 is column A, 2 = column B, ......
FieldNum = 5 'I changed this to 3 for column C
'Turn off AutoFilter
My_Range.Parent.AutoFilterMode = False
'Change ScreenUpdating, Calculation, EnableEvents, ....
With Application
CalcMode = .Calculation
.Calculation = xlCalculationManual
.ScreenUpdating = False
.EnableEvents = False
End With
ViewMode = ActiveWindow.View
ActiveWindow.View = xlNormalView
ActiveSheet.DisplayPageBreaks = False
'Add a worksheet to copy the a unique list and add the CriteriaRange
Set ws2 = Worksheets.Add
With ws2
'first we copy the Unique data from the filter field to ws2
My_Range.Columns(FieldNum).AdvancedFilter _
Action:=xlFilterCopy, _
CopyToRange:=.Range("A1"), Unique:=True
'loop through the unique list in ws2 and filter/copy to a new sheet
Lrow = .Cells(Rows.Count, "A").End(xlUp).Row
For Each cell In .Range("A2:A" & Lrow)
'Filter the range
My_Range.AutoFilter Field:=FieldNum, Criteria1:="=" & _
Replace(Replace(Replace(cell.Value, "~", "~~"), "*", "~*"), "?", "~?")
'Check if there are no more then 8192 areas(limit of areas)
CCount = 0
On Error Resume Next
CCount = My_Range.Columns(1).SpecialCells(xlCellTypeVisible) _
.Areas(1).Cells.Count
On Error GoTo 0
If CCount = 0 Then
MsgBox "There are more than 8192 areas for the value : " & cell.Value _
& vbNewLine & "It is not possible to copy the visible data." _
& vbNewLine & "Tip: Sort your data before you use this macro.", _
vbOKOnly, "Split in worksheets"
Else
'Add a new worksheet
Set WSNew = Worksheets.Add(After:=Sheets(Sheets.Count))
On Error Resume Next
WSNew.Name = cell.Value
If Err.Number > 0 Then
ErrNum = ErrNum + 1
WSNew.Name = "Error_" & Format(ErrNum, "0000")
Err.Clear
End If
On Error GoTo 0
'Copy the visible data to the new worksheet
My_Range.SpecialCells(xlCellTypeVisible).Copy
With WSNew.Range("A1")
' Paste:=8 will copy the columnwidth in Excel 2000 and higher
' Remove this line if you use Excel 97
.PasteSpecial Paste:=8
.PasteSpecial xlPasteValues
.PasteSpecial xlPasteFormats
Application.CutCopyMode = False
.Select
End With
End If
'Show all data in the range
My_Range.AutoFilter Field:=FieldNum
Next cell
'Delete the ws2 sheet
On Error Resume Next
Application.DisplayAlerts = False
.Delete
Application.DisplayAlerts = True
On Error GoTo 0
End With
'Turn off AutoFilter
My_Range.Parent.AutoFilterMode = False
If ErrNum > 0 Then
MsgBox "Rename every WorkSheet name that start with ""Error_"" manually" _
& vbNewLine & "There are characters in the name that are not allowed" _
& vbNewLine & "in a sheet name or the worksheet already exist."
End If
'Restore ScreenUpdating, Calculation, EnableEvents, ....
My_Range.Parent.Select
ActiveWindow.View = ViewMode
With Application
.ScreenUpdating = True
.EnableEvents = True
.Calculation = CalcMode
End With
End Sub

What I need help with is to add a particular set of formulas to the bottom of each sheet that is created from the above macro. The following macro adds the formulas to all the sheets in the workbook. I need it to add the formulas to only the sheets that are created in the above macro. The number of sheets created change every time they are generated, depending on the source data. I was thinking it might be best to merge bottom macro into the top but I have no idea how to go about doing that.

I wouldn't combine the 2 macros, simply call the Insert_Formulas macro from the Copy_To_Worksheets macro when it is needed.

To call the macro all you need is this line:

Insert_Formulas

Edit to respond to comment:

Given you don't know how many sheets are being added I have one suggestion you may try.

High level, add text to a cell in each sheet to indicate if it is new or not. When new sheet is created cell should say "new". When not new it should say "existing". Then in the

If you want to give this a try, and let me know what doesn't work I can check back and help update the code.

In the Copy_To_Worksheets macro you'll need to add a line to set all existing sheets to "existing"

In then Copy_To_Worksheets macro add a line so that new sheets get set to "new"

In Insert_Formulas macro, still loop through all sheets, but check to see if the sheet is "new", and if so, run the code to add the formulas.

A cleaner (but slightly more difficult) option would be to define a name on each sheet (use the same name for each and limit the scope to each individual sheet) and use that instead of a cell on each sheet.